what is the reason for using have instead of has in the following, she must have a big lawn?

Answer 1

The sentence can be framed in 2ways:
1. she must have a big lawn
2. She has a big lawn.
so if u wanna use 'has', u must drop d 'must'.But it'll change d meaning of d sentence alltogether.......so.........

Answer 2

A verb can be either in the finitive or infinitive form. The finitive form is also called finite.

A verb in the finitive form is said to be conjugated and always shows the person, the number, the tense and the mood. These are shown by the ending (-s, -ed, -ing...). For example:

I walk to school. (person - first - I, number - singular - one person, tense - Present - happening now, mood - Indicative - a real fact).

Variations: I walked to school, She walks to school, We are walking to school, I have walked to school, If I had walked to school, etc...

A verb in the infinitive form is not conjugated and shows always the same form. It can almost never stand alone, it usually needs another verb. It is often used with "to". It doesn't indicate anything, except the meaning of the verb proper, but since it is often used together with a finite verb (usually an auxiliary verb), it may borrow certain features from the finite verb. For example:

I want to walk to school.

I can walk to school.

I have to walk to school.

I will walk to school.

I should walk to school.

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In the example you are bringing up:

She HAS a big lawn. HAS is the finite form of HAVE and refers back to the third person (she), singular (one person), present tense and indicative mood.

She must HAVE a big lawn. MUST is a finitive verb. HAVE is the infinitive form of HAVE and doesn't change. There is no TO attached to it, because the verb MUST doesn't require it. Buf if you used the verb WANT, you would say: She wants TO HAVE a big lawn.

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Hope this is clear enough for you.

Answer 3

The grammatical term you are using is called the "subjunctive mood". It's more subtle in English than in other languages.

The subjunctive mood expresses wishes, hypothetical situations, and similar statements that might be contrary to fact.

Compare: you would never say "this bathroom be clean", but it's proper to say "it's important to us that this bathroom be clean at all times". That's the subjunctive. The referenced Wikipedia article has a nice chart.

Answer 4

in proper grammer you must conjugate your verbs properly.

she has a big lawn.

means that the woman is in posesion of a large plot of grass.

does it sound right to you to say

"she have a big lawn"

it shouldn't.

the conjucation for the verb "to have " goes as follows

I have
you have
he/she/it has

we have
you (plural)/ y'all have
they have

please note that the third person singular ( he /she/ it) is different than all the others. this is commun amung english verbs of the present tense.

i the tence where you assume things ( using "should", "would", or , "must" ) the verb conjugates as follows

I must have
you must have
he/she/it must have

we must have
you/y'all must have
they must have.

if you study another language you will start to understand things like this better.
if you don't understand what i am talking about please learn another language other than english or as someone who has learned more than one languae.
the only reason that i cand conjugate english verbs is that i speak 4 languages.

Answer 5

I'll break this down for you in girlfriends-talking terms so that you can understand....For an example Paris Hilton MUST HAVE a big closet...you are IMAGINING that she has it, though you are not sure..Paris Hilton HAS a big closet means she has a big closet you know that for a FACT, make sense?

Answer 6

sometimes 'have' is used to denote ownership of some things. here have is used for that purpose